AUDI CAN bridge to APIs

[chris_audi]

Update 21.02.2023:
- optimized the script a bit with chat gpt :-D
- changed the way of sending canbus messages. Sending via bus directly in python now instead of os.system
- changed reading path method to better install api files. It doesn't matter anymore from wich path you're starting the script.
- send tv input activation message even if send_to_canbus is False
- added transparent reversecamera guide lines image to reversecamera function. Included in zip but you may need to modify the image to fit to your reversecamera
- using now integer instead of round function for speed, rpm and coolant with integer. Before: 10,5 km/h -> 16 km/h. After: 10,5 km/h -> 10 km/h.
- added function to write error messages to a logfile:
  -> the messages will be saved in the script folder with date and name of the script. Example: 2023-02-01_read_from_canbus_errors.log
- the script will now check, if the tv input automation and hands free message are already send by another module. If this is the case, the scrippt will disable sending these messages
- if toggle_values_by_rnse_longpress is activated and toggle_fis1 or toggle_fis2 = 12 (DISABLE) the script will disable sending content and the normal dis/fis message will show up (example: "TV/VIDEO")
- small bugfix

Bugfix 20.04.2023:
toggle_fis2 == 1 showed artist instead of title

Update 10.05.2023:
-support for mph - selectable with "km/h" and "mph"
-support for °F - selectable with "°C" and "°F"

Feel free to test and give feedback, if you can ;-)

  read_from_canbus.zip (Size: 42.68 KB / Downloads: 91)

[3de]

This is some crazy impressive work! Thank you so much for sharing!

I just bought OpenAuto Pro and can't wait to test this on my 8EC B7.

I wonder how you wake up the Pi on the next car start, since you mentioned permanent power connection to the Pi.

Since OpenAuto Pro API offers fetching navigation data from AA, do you think it's possible to send distance and turn information / arrows / roundabout circle information to the FIS like the RNS-E built in navigation does when active? I guess this depends on which DDP/BAP CAN messages are discovered already regarding navigation?

[3de]

Hi again,

I just tested the script (started it manually via terminal window).

I'm running bluewavestudio-openauto-pro-release-16.0.img. I'm not having an old version for now since I just bought OAP.

That's the output:

missing python modules: set()
up
can0 is up, continue
Traceback (most recent call last):
  File "/home/pi/scripts/read_from_canbus.py", line 162, in <module>
    import common.Api_pb2 as oap_api
  File "/home/pi/scripts/common/Api_pb2.py", line 37, in <module>
    create_key=_descriptor._internal_create_key),
  File "/home/pi/.local/lib/python3.7/site-packages/google/protobuf/descriptor.py", line 796, in __new__
    _message.Message._CheckCalledFromGeneratedFile()
TypeError: Descriptors cannot not be created directly.
If this call came from a _pb2.py file, your generated code is out of date and must be regenerated with protoc >= 3.19.0.
If you cannot immediately regenerate your protos, some other possible workarounds are:
1. Downgrade the protobuf package to 3.20.x or lower.
2. Set PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python (but this will use pure-Python parsing and will be much slower).

More information: https://developers.google.com/protocol-buffers/docs/news/2022-05-06#python-updates

I downgraded protobuf as suggested:

pip install 'protobuf<=3.20.1' --force-reinstall
[...]
Successfully installed protobuf-3.18.0

Running the script again (also after reboot) did not help.

Regarding OpenAuto System requirements, I don't have an external Bluetooth adapter on my PI 3B for now, which shouldn't affect this though.

Kind regards :)

[chris_audi]

Hi again,

I just tested the script (started it manually via terminal window).

I'm running bluewavestudio-openauto-pro-release-16.0.img. I'm not having an old version for now since I just bought OAP.

That's the output:

missing python modules: set()
up
can0 is up, continue
Traceback (most recent call last):
  File "/home/pi/scripts/read_from_canbus.py", line 162, in <module>
    import common.Api_pb2 as oap_api
  File "/home/pi/scripts/common/Api_pb2.py", line 37, in <module>
    create_key=_descriptor._internal_create_key),
  File "/home/pi/.local/lib/python3.7/site-packages/google/protobuf/descriptor.py", line 796, in __new__
    _message.Message._CheckCalledFromGeneratedFile()
TypeError: Descriptors cannot not be created directly.
If this call came from a _pb2.py file, your generated code is out of date and must be regenerated with protoc >= 3.19.0.
If you cannot immediately regenerate your protos, some other possible workarounds are:
1. Downgrade the protobuf package to 3.20.x or lower.
2. Set PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python (but this will use pure-Python parsing and will be much slower).

More information: https://developers.google.com/protocol-buffers/docs/news/2022-05-06#python-updates

I downgraded protobuf as suggested:

pip install 'protobuf<=3.20.1' --force-reinstall
[...]
Successfully installed protobuf-3.18.0

Running the script again (also after reboot) did not help.

Regarding OpenAuto System requirements, I don't have an external Bluetooth adapter on my PI 3B for now, which shouldn't affect this though.

Kind regards

Check this thread:
https://bluewavestudio.io/community/thread-3731.html

And do you have tried downgrading with „pip3“ for python 3 ?

[chris_audi]

Update 2023-08-20:
- script will now save log outputs in /logs folder from the script. if the folder doesn't exist, it will create the folder.
- script will check the can bus connection with a test message. If the canbus isn't working, it will stop sending on the can bus.
- script will check if a other instance of the script is already running. If so, it will close all instances except the actual instance.
 -integrated a socket connection to control the script remotely via a website (or from other scripts) running on the rasperry pi.
      - you can see an example of my php website in the attachments
- script will now clear the fis/dis content if it gets closed by script or remotely
- script will explicitly check for protobuf version 3.20.3 at startup to prevent incompability
      - if a other version is installed, it will uninstall that version and install 3.20.3
      - https://bluewavestudio.io/community/thre...l#pid19881
      - https://bluewavestudio.io/community/thre...l#pid19400

  read_from_canbus.zip (Size: 43.78 KB / Downloads: 38)

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I've made a website running on the raspberry pi to control the raspberry pi and the scritp to save some time.
On my raspberry pi the website is accessible via http://raspberrypi if i am connected to the raspberry pi wifi hotspot.

Some informations for the control website:
- You need to install a webserver on the raspberry pi first
- If you got the webserver running, you can copy the content from "rpi remote control website.zip" to (normaly) "/var/www/html/"

- After pressing a button, the page will reload the page after 5 seconds
      - this will not work wiht reboot and shutdown button, because raspberry pi can't respond anymore ;-)
- Button "Start script" has an fixed path: "/home/pi/scripts/read_from_canbus.py"
- Button "vcan0 -> can0" will change "can_interface = 'vcan0'" to "can_interface = 'can0'" if you forgot to change that after testing with virtual an on desk setup :-)
- Button "can0 -> vcan0" will change "can_interface = 'can0'" to "can_interface = 'vcan0'"
      - if you forgot to change vcan0 to can0 in the script on desk test setup, you can use this button instead of using a notebook and edit the file

  rpi remote control website.zip (Size: 66.79 KB / Downloads: 27)

Screenshot:
   

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If you want to use the two buttons "vcan0 -> can0" and "can0 -> vcan0" you have to copy the files to "/home/pi/scripts/" folder.
Don't forget to set the correct permissions for these files ;-)

  change_vcan0_can0.zip (Size: 827 bytes / Downloads: 25)

[GSPW]

Thanks for sharing, homegrown code for the win!

[Weagle]

Awesome work. I retrofitted my system into an old RNS-D for my A4 8E and was wondering if your script supports steering wheel control?

[chris_audi]

Awesome work. I retrofitted my system into an old RNS-D for my A4 8E and was wondering if your script supports steering wheel control?

You have to try. There is a multi function steering wheel detection built in, but i couldn't test it by myself because i have no multi function steering wheel
If you have hands free (bluetooth) in your A4 and it writes something like your phonebook, call status to dis/fis it would be much harder.

If it doesn't work and you are able to candump some button presses, we can try to get it work :-)
But you woul need to candump to a file for each button press. For example with command "candump can0,65F:7EF,5C3:7EF,461:7EF -tA -a > dump_scroll_up.txt"

I'll write you my telegram name in a private message ;-)